大同

大同 may refer to:
 * Great Unity, a classical Chinese concept for an utopian view of the world

Cities

 * Datong, a prefecture-level city in Shanxi, China

Counties

 * Datong County, Shanxi, China

Districts

 * Datong District, Daqing, Heilongjiang, China
 * Datong District, Taipei, Taiwan

Towns

 * Datong, Yilan, Taiwan

Institutions and universities

 * Shanxi Datong University, in Datong, Shanxi, China
 * Tatung University, Taipei, Taiwan
 * Tatung Institute of Commerce and Technology, in Chiayi County, Taiwan
 * Utopia University, or Datong University, in Shanghai, China

Companies and sport clubs

 * Datong Coal Mining Group, state-owned coal mining enterprise of China
 * Datong Coal Industry, a subsidiary and listed company of Datong Coal Mining Group
 * CRRC Datong, since 2003 'CNR Datong Electric Locomotive Co. Ltd' (DELC), in Datong, Shanxi, China
 * Tatung Company, Taiwanese electronics company
 * Tatung F.C., a Taiwanese football club owned by the company

Historical eras

 * Datong, Chinese era name corresponding to 535 through 546, used by Emperor Wu of Liang
 * Datong, Chinese era name corresponding to 947, used by Emperor Taizong of Liao
 * Datong, Chinese era name corresponding to 1224 through 1233, used by Puxian Wannu
 * Daidō, Japanese era name corresponding to February 1466 through March 1467
 * Datong, Chinese era name corresponding to 1932 through 1934, used by Puyi as Chief Executive of Manchukuo

Other uses

 * The Chinese Mayor, original title Datong, documentary film